Marjorie is trying to determine the identity of an unknown substance. After running tests, she determines that the substance is insoluble in CCl4 with a density of about 2.2 g/mL. Substance Density Boiling Point Solubility (in water) Solubility (in CCl4) NaCl 2.165 g/mL 1413°C soluble insoluble C10H8 1.14 g/mL 255°C insoluble soluble FeCl3 2.898 g/mL 315°C soluble insoluble SiO2 2.634 g/mL 2590°C insoluble insoluble Using the data above, which of the following substances is most likely Marjorie's unknown?

Question

Marjorie is trying to determine the identity of an unknown substance. After running tests, she determines that the substance is insoluble in CCl4 with a density of about 2.2 g/mL.  Substance	Density	Boiling Point	Solubility (in water)	Solubility (in CCl4) NaCl	2.165 g/mL	1413°C	soluble	insoluble C10H8	1.14 g/mL	255°C	insoluble	soluble FeCl3	2.898 g/mL	315°C	soluble	insoluble SiO2	2.634 g/mL	2590°C	insoluble	insoluble   Using the data above, which of the following substances is most likely Marjorie's unknown?